APA-referens (7:e uppl.)

Williams, J. W., Hellman, L. M., & Pritchard, J. A. (1971). Williams obstetrics (14th ed.). Appleton-Century-Crofts.

Chicago-referens (17:e uppl.)

Williams, J. Whitridge, Louis M. Hellman, och Jack A. Pritchard. Williams Obstetrics. 14th ed. New York: Appleton-Century-Crofts, 1971.

MLA-referens (9:e uppl.)

Williams, J. Whitridge, et al. Williams Obstetrics. 14th ed. Appleton-Century-Crofts, 1971.